<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>demo01</title>
</head>
<body>
  <!-- this 丢失 -->
  <script>
    var obj = {
      name : 'Ling',
      print : function() {
        return this.name;
      }
    }

    console.log(obj.print())

    var myPrint = obj.print
    // this -> window
    console.log(myPrint())

  </script>
</body>
</html>